I have an SBS 2008 server which was configured to accept email from a second domain. For the past year only two of the users were using this secondary domain and there have been no problems. Yesterday I tried to add secondary email addresses for several other users. All email sent to the newly created secondary addresses is being bounced. Email to the original 2 users' secondary addresses is still being delivered.
To add the additional email address I simply added a second SMTP entry to each user's email profile using the Exchange Console.
Any ideas what the problem might be?